Moreover, sparsely stained airways (defined as SCGB1A1/EH <0.025) were significantly more represented in the UIP pathological patterns [UIP 18/33 vs. non-UIP 4/31 (p = 0.0027)] (Table 2 and Figure 3). Here, SCGB1A1 is linked to idiopathic pulmonary fibrosis.